Unit
Part Number
Software Revision
ISU 128
1202.029
E.00
ISU 2x64
1200.051
D.00 or G.00
ISU Express L6
1200.081L6
K.28
ISU Express L6
1202.081L6
D.43
Note: Since requirements may change, verify the firmware requirements with Using ADTRAN ISUs With
Cisco Routers
.
Components Used
The information in this document is based on the software and hardware versions below.
A router with a synchronous serial interface. The serial interface can be built−in or on a
WIC/Network Module.
•
There are no Cisco IOS® software restrictions for this configuration.
•
The information presented in this document was created from devices in a specific lab environment. All of the
devices used in this document started with a cleared (default) configuration. If you are working in a live
network, ensure that you understand the potential impact of any command before using it.
Conventions
Refer to Cisco Technical Tips Conventions for more information on document conventions.
Dialing Method
There are three methods that can be used to initiate a dial by the TA:
V.25 or V.25bis dialing
•
Data Terminal Ready (DTR) dialing
•
Keypad dialing
•
V.25 or V.25bis Dialing
Using this method, the router sends a phone number to the TA. This method allows the router to place and
receive ISDN calls. To activate V.25/V,.25bis dialing, you must configure the dialer in−band command on
the router interface. For example:
interface Serial0
ip address 172.25.254.97 255.255.255.252
encapsulation ppp
dialer in−band
dialer idle−timeout 300
dialer map ip 172.25.254.98 name Remote broadcast 5551212&5551213
ppp authentication chap
dialer−group 1
You should configure the ISU for V.25bis dialing and MPPP.
When the router receives interesting traffic, it raises DTR and Request To Send (RTS), which causes the TA
to initiate a dial on the first B−channel. However, the router does not ask the TA to initiate the second
